Sha256: ede837cd7d8d8adb18ab7e0994fd1adcbd1f5acf1af3b47361eb258b32648fff
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Size: 243 Bytes
Versions: 15
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Stored size: 243 Bytes
Contents
class Integer
def fibonacci?
return true if self == 1
# Posamentier, Alfred; Lehmann, Ingmar (2007). The (Fabulous) FIBONACCI
# Numbers. Prometheus Books. pp. 305
[4, -4].map{|x| (5 * (self**2)) + x}.one? &:square?
end
end
Version data entries
15 entries across 15 versions & 1 rubygems